<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div class="box1">
        <div class="box2"></div>
    </div>
</body>
<style>
    body{
        height: 200px;
        position: relative;
    }
    .box1{
        width: 500px;
        height: 500px;
       border: 1px solid blueviolet;
       margin: 200px;
       position: relative;
    }
    .box2{
        width: 100px;
        height: 100px;
        background: pink;
        position: absolute;
    left: 0;
        top: 0;
    }
</style>
</html>